package com.share.tool.generator.ssl;

import javax.net.ssl.*;
import java.io.*;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Socket;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

/**
 * https://github.com/escline/InstallCert/blob/master/InstallCert.java
 * <p>
 * 将证书自动追加到 到$JAVA_HOME/jre/lib/security/cacerts 文件中
 */
public class InstallCert {

    //java InstallCert api.openai.com:443
    //java InstallCert api.openai.com

    // String ars[] = {"chat.openai.com:443"};
    //        main(args);
    public static final String TMP_CACERTS = "cacerts.tmp";

    public static void main(String[] args) throws Exception {
        String host = null;
        int port = -1;
        char[] passphrase = null;

        // proxy
        boolean useProxy = false;
        String proxyHost = null;
        int proxyPort = -1;
        InetSocketAddress proxyAddr = null;
        Socket underlying = null;

        int numArg = 0;
        int nbArgs = args.length;
        boolean invalidArgs = false;
        boolean isQuiet = false;
        while (numArg < nbArgs) {
            String arg = args[numArg++];
            if (arg.startsWith("--proxy=")) {
                String proxy = arg.substring("--proxy=".length());
                useProxy = true;
                String[] c = proxy.split(":");
                proxyHost = c[0];
                proxyPort = Integer.parseInt(c[1]);  // proxy port is mandatory (we don't default to 8080)
            } else if (arg.startsWith("--quiet")) {
                isQuiet = true;
            } else if (host == null) {  // 1st argument is the "host:port"
                String[] c = arg.split(":");
                host = c[0];
                port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
            } else if (passphrase == null) {  //  2nd argument is the keystore passphrase
                passphrase = arg.toCharArray();
            } else {
                invalidArgs = true;  // too many args
            }
        }

        if (host == null) {
            invalidArgs = true;
        }

        if (invalidArgs) {
            System.out.println("Usage: java InstallCert [--proxy=proxyHost:proxyPort] host[:port] [passphrase] [--quiet]");
            System.out.println("Usage: java -jar share-downssl.jar api.aliyum.com");
            return;
        }

        // default values
        if (port == -1) {
            port = 443;
        }
        if (passphrase == null) {
            passphrase = "changeit".toCharArray();
        }

        char SEP = File.separatorChar;
        File dir = new File(System.getProperty("java.home") + SEP + "lib" + SEP + "security");
        File file = new File(dir, "cacerts");

        System.out.println("Loading KeyStore " + file + "...");
        InputStream in = new FileInputStream(file);
        KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
        ks.load(in, passphrase);
        in.close();

        if (useProxy) {
            proxyAddr = new InetSocketAddress(proxyHost, proxyPort);
            underlying = new Socket(new Proxy(Proxy.Type.HTTP, proxyAddr));
        }

        SSLContext context = SSLContext.getInstance("TLS");
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        tmf.init(ks);
        X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];
        SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
        context.init(null, new TrustManager[]{tm}, null);
        SSLSocketFactory factory = context.getSocketFactory();

        System.out.println("Opening connection to " + host + ":" + port + (useProxy ? (" via proxy " + proxyHost + ":" + proxyPort) : "") + " ...");
        SSLSocket socket;
        if (useProxy) {
            underlying.connect(new InetSocketAddress(host, port));
            socket = (SSLSocket) factory.createSocket(underlying, host, port, true);
        } else {
            socket = (SSLSocket) factory.createSocket(host, port);
        }
        socket.setSoTimeout(10000);
        try {
            System.out.println("Starting SSL handshake...");
            socket.startHandshake();
            socket.close();
            System.out.println();
            System.out.println("No errors, certificate is already trusted");
        } catch (SSLException e) {
            System.err.println();
            e.printStackTrace(System.err);
        }

        X509Certificate[] chain = tm.chain;
        if (chain == null) {
            System.err.println("Could not obtain server certificate chain");
            return;
        }

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        System.out.println();
        System.out.println("Server sent " + chain.length + " certificate(s):");
        System.out.println();
        MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        for (int i = 0; i < chain.length; i++) {
            X509Certificate cert = chain[i];
            System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());
            System.out.println("   Issuer  " + cert.getIssuerDN());
            sha1.update(cert.getEncoded());
            System.out.println("   sha1    " + toHexString(sha1.digest()));
            md5.update(cert.getEncoded());
            System.out.println("   md5     " + toHexString(md5.digest()));
            System.out.println();
        }

        int k;
        if (isQuiet) {
            System.out.println("Adding first certificate to trusted keystore");
            k = 0;
        } else {
            System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1](输入数字 或 回车则继续,q则退出)");
            String line = reader.readLine().trim();
            try {
                k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
            } catch (NumberFormatException e) {
                System.err.println("KeyStore not changed");
                return;
            }
        }

        X509Certificate cert = chain[k];
        String alias = host + "-" + (k + 1);
        ks.setCertificateEntry(alias, cert);

        File tmpFile = new File(TMP_CACERTS);
        OutputStream out = new FileOutputStream(tmpFile);
        ks.store(out, passphrase);
        out.close();

        System.out.println();
        System.out.println(cert);
        System.out.println();
        System.out.println(">>>>>-----------临时密钥数据文件路径=" + tmpFile.getAbsolutePath());
        System.out.println(String.format(">>>>>-----------存在文件,则继续tmp_cacerts=%s,alias=%s", TMP_CACERTS, alias));
        System.out.println();

        //2.导出证书
        String exec1 = "导出cer格式证书 keytool -exportcert -alias " + alias + " -keystore " + TMP_CACERTS + " -storepass changeit -file " + host + ".cer";
        System.out.println(exec1);

        //3.安装证书
        String exec2 = "安装cer格式证书 keytool -importcert -alias " + host + " -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit -file " + host + ".cer";
        System.out.println(exec2);

        //其他的提示命令
        System.out.println();
        System.out.println("---扩展");
        System.out.println("---查看已安装证书  keytool -list -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit");
        System.out.println("---删除已安装证书  keytool -delete -alias " + host + " -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit");
    }

    private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

    private static String toHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 3);
        for (int b : bytes) {
            b &= 0xff;
            sb.append(HEXDIGITS[b >> 4]);
            sb.append(HEXDIGITS[b & 15]);
            sb.append(' ');
        }
        return sb.toString();
    }

    private static class SavingTrustManager implements X509TrustManager {

        private final X509TrustManager tm;
        private X509Certificate[] chain;

        SavingTrustManager(X509TrustManager tm) {
            this.tm = tm;
        }

        public X509Certificate[] getAcceptedIssuers() {
            // This change has been done due to the following resolution advised for Java 1.7+
            // http://infposs.blogspot.kr/2013/06/installcert-and-java-7.html
            return new X509Certificate[0];
            //throw new UnsupportedOperationException();
        }

        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            throw new UnsupportedOperationException();
        }

        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            this.chain = chain;
            tm.checkServerTrusted(chain, authType);
        }
    }
}